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established. When the appliance heats up it should operate in a normal manner.
8.
GAS ODOR AT PRIMARY AIR OPENINGS:
Under normal burner operation, a negative pressure (vacuum) should exist inside the primary
air openings of a burner, drawing in air. If all gas fed to the burner by the orifice does not flow
to the burner head, some gas may spill from the primary air openings. If this condition is found,
check the burner body for restrictions, and check the orifice to make certain it is not out of line.
9.
CORROSION OF APPLIANCES:
Gas appliances are designed and built to give long dependable service life. In some installations
recently, usually severe corrosion has occurred resulting in customer complaints. This corrosion
is attributed to the extensive use of aerosol propellants, hydrocarbons which contain the
elements FLOURINE AND CHLORINE. These elements are called halogens. Halogens in their
free state are very corrosive. When the propellants pass through a flame, they break down and
the halogen gases are released. In combination with the water vapor in the flue gases they
cause corrosion in heat exchangers, flue-ways and other appliance parts.
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